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Nonunity gain quantum nondemolition measurements based on measurement and repreparation

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Leuchs,  Gerd
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Andersen,  Ulrik L.
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Schneider, J., Gloeckl, O., Leuchs, G., & Andersen, U. L. (2006). Nonunity gain quantum nondemolition measurements based on measurement and repreparation. OPTICS LETTERS, 31(17), 2628-2630. doi:10.1364/OL.31.002628.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6D84-8
Abstract
We demonstrate experimentally a nonunity gain quantum nondemolition measurement based on a simple homodyne measurement and recreation strategy. Although the output state is an amplified version of the input state, the device meets standard criteria for QND measurements: the transfer coefficient was measured to 1,78, and the conditional variance was measured to 0.66. (c) 2006 Optical Society of America.